Design and analysis of experimental performance of the Los Alamos HIBAF facility accelerator using the INEX computer model

Carlsten, Bruce E.; Young, L.M.; Jones, Michael E.; Thode, L.E.; Lumpkin, A.H.; Feldman, D. W.; Feldman, Robert; Blind, B.; Browman, M.J.; O’Shea, P.G.

doi:10.1109/3.104137

Cited by 21 publications

(7 citation statements)

References 11 publications

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“…Note that if the field is axially constant (k q 0), the axial field vanishes. It is well known that an axially constant quadrupole field produces linear forces, although it is also known that a quadrupole field in a constant axial field of a solenoid can cause significant emittance growth [12]. The PPM field looks like an alternating solenoid, so there is a potential emittance growth mechanism, which we numerically quantify here.…”

Section: Comparison Of Different Horizontal Focusing Schemes-high-mentioning

confidence: 99%

Stable two-plane focusing for emittance-dominated sheet-beam transport

Carlsten

Earley

Krawczyk

et al. 2005

Phys. Rev. ST Accel. Beams

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Two-plane focusing of sheet electron beams will be an essential technology for an emerging class of high-power, 100 to 300 GHz rf sources [Carlsten et al., IEEE Trans. Plasma Sci. 33, 85 (2005)]. In these devices, the beam has a unique asymmetry in which the transport is emittance dominated in the sheet's thin dimension and space-charge dominated in the sheet's wide dimension. Previous work has studied the stability of the transport of beams in the emittance-dominated regime for both wiggler and periodic permanent magnet (PPM) configurations with single-plane focusing, and has found that bigger envelope scalloping occurs for equilibrium transport, as compared to space-charge dominated beams [Carlsten et al., this issue, Phys. Rev. ST Accel. Beams 8, 062001 (2005)]. In this paper, we describe the differences in transport stability when two-plane focusing is included. Two-plane wiggler focusing degrades the transport stability slightly, whereas two-plane PPM focusing greatly compromises the transport. On the other hand, single-plane PPM focusing can be augmented with external quadrupole fields to provide weak focusing in the sheet's wide dimension, which has stability comparable to two-plane wiggler transport.

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Section: Comparison Of Different Horizontal Focusing Schemes-high-mentioning

confidence: 99%

Stable two-plane focusing for emittance-dominated sheet-beam transport

Carlsten

Earley

Krawczyk

et al. 2005

Phys. Rev. ST Accel. Beams

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“…(1)]. Fortunately electron beams produced by photoinjector linacs have a very small energy spread (CF£-<*C1%) which exhibits only a weak dependence on beam current [8], In this Letter we describe experiments that demonstrate third harmonic lasing («//=3) in the wavelength range from 369 to 380 nm using a 45.9-45.2-MeV range of electron energies. Except for the details discussed below, the configuration of the FEL for the UV experiments was similar to that used for our previous infrared studies and has been extensively described [9].…”

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confidence: 96%

“…The advantage of this approach is that UV lasing can be achieved with low-energy electrons (y<100) by using a higher harmonic inn > 1) and by using a short-period wiggler. This approach has been made possible by the recent revolution in the design and construction of low-energy electron linear accelerators [8]. The introduction of radio-frequency photocathode electron guns has allowed the production and rapid acceleration of high-current beams without low-energy drift and bunching sections between the source and the accelerator.…”

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confidence: 99%

“…The APEX accelerator [8,9] used for these experiments had an rf photocathode electron source [11]. The electron energy was increased from its nominal value of 40 MeV [9] to 46 MeV for these experiments.…”

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confidence: 99%

“…Further details of the electron beam properties and measurement techniques may be found in Refs. [8] and [9], and references therein.…”

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confidence: 99%

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Ultraviolet free-electron laser driven by a high-brightness 45-MeV electron beam

et al. 1993

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We report on experimental studies of an ultraviolet (UV) free-electron laser (FEL) oscillator driven by low-energy electrons from a radio-frequency linear accelerator. Previous UV FELs have been driven by 350-800-MeV electrons from storage rings. We verify the concept of driving an UV FEL with a low-energy, but high-current, low-emittance electron beam. This and other innovations allowed the FEL to lase at wavelengths from 369 to 380 nm using 45.9-45.2-MeV electrons, and to achieve a peak optical output power of 270 kW. The experimental results are in good agreement with simulations.

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